Getting lost down an internet rabbit hole can be an enlightening and educational experience, a complete waste of time, or a twisted journey into the dark depths of the human psyche.
In other words there's some really horrifying stuff posted online for all the world to behold, but there's also plenty of scary stuff to read online that won't result in mental trauma.
If you're looking to read about some interesting yet scary stuff you should start your journey with BuzzFeed's list of Creepy Wikipedia Pages That Will Keep You Up At Night.
It features classic creep outs like the Cleveland Torso Murderer, who dismembered at least a dozen people but was never caught, or the mysterious Cicada 3301 organization, who are recruiting "highly intelligent individuals" with complex internet puzzles.
And when you have a few weeks to kill you can continue your investigation at the subreddit Unresolved Mysteries, where lots more creepy mysteries await budding online investigators.